Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.8.0.1
Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Rate at which options vest per month 2.00%    
Period over which options vest and become exercisable 50 months    
Cash from stock options exercised $ 0.1 $ 1.0 $ 0.2
Total intrinsic value of options exercised 0.1 1.8 0.1
Total fair value of option vested $ 0.3 $ 1.3 $ 0.9
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise of options in year 2020    
Vesting of RSUs in year 2020    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise of options in year 2022    
Vesting of RSUs in year 2022    
2009 Long-Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Plan termination date Apr. 23, 2019    
Unrecognized cost related to nonvested shared-based compensation $ 5.9    
Expected cost to be recognized over a weighted-average period 3 years 6 months 14 days    
2009 Long-Term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The RSUs entitle the recipient to receive one share of Class A common stock for each RSU upon vesting. The RSUs vest with cliff vesting in 5 years, provided that the recipient is still an employee or director of Gaia on such date.    
Restricted stock units vesting term 5 years    
2009 Long-Term Incentive Plan [Member] | Class A Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares that may be issued 3,000,000    
Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense related to share-based payment awards 5 years    
Board Members [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense related to share-based payment awards 5 years