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Stock-Based Compensation - Performance Based Restricted Stock Units (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jul. 03, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair value assumptions:          
Stock based compensation expenses $ 250,000   $ 877,000 $ (276,000) $ 3,895,000
Restricted stock units - performance based awards          
Number of Shares          
Unvested at beginning of period (in shares)       988,958 988,958
Forfeited (in shares)       (988,958)  
Unvested at end of period (in shares) 0   988,958 0 988,958
Weighted Average Grant Date Fair Value          
Unvested at beginning of period (in dollars per share)       $ 4.48 $ 4.48
Forfeited (in dollars per share)       4.48  
Unvested at end of period (in dollars per share) $ 0   $ 4.48 $ 0 $ 4.48
Fair value assumptions:          
Stock based compensation expenses $ (123,000)   $ (332,000) $ (1,148,000) $ 469,000
Unrecognized stock-based compensation expense 0     0  
President, chief executive officer, and chief financial officer | Restricted stock units - performance based awards          
Number of Shares          
Forfeited (in shares)   (988,958)      
Fair value assumptions:          
Estimated expense reduction in stock compensation expense related to forfeited stock awards $ 100,000     $ 1,400,000