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Stockholders' Equity (Stock Option Plans) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 29, 2019
Feb. 29, 2020
Mar. 31, 2020
Jan. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]        
Weighted average grant date fair value, vested     $ 100  
Weighted average remaining contractual term, outstanding     5 years 2 months 1 day  
Weighted average remaining contractual term, vested and exercisable     4 years 7 days  
Stock options        
Number of Options        
Balance outstanding at the beginning of the period (in shares)     1,802,463  
Granted (in shares)     191,667  
Expired (in shares)     (317,992)  
Balance outstanding at the end of the period (in shares)     1,676,138  
Total vested and exercisable (in shares)     1,266,859  
Weighted Average Exercise Price per Share        
Balance at the beginning of the period (in dollars per share)     $ 6.75  
Granted (in dollars per share)     0.98  
Expired (in dollars per share)     8.19  
Balance at the end of the period (in dollars per share)     5.81  
Total vested and exercisable (in dollars per share)     $ 6.72  
Aggregate Intrinsic Value (in Thousands)        
Outstanding at end of the period     $ 0  
Total vested and exercisable     0  
Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]        
Weighted average grant date fair value, vested     $ 400  
Number of Shares        
Unvested beginning of period (in shares)     4,436,928  
Granted (in shares)     225,000  
Vested (in shares)     (593,644)  
Forfeited (in shares)     (146,676)  
Unvested end of period (in shares)     3,921,608  
Weighted Average Fair Value        
Unvested beginning of period (in dollars per share)     $ 1.54  
Granted (in dollars per share)     1.39  
Vested (in dollars per share)     0.69  
Forfeited (in dollars per share)     1.30  
Unvested end of period (in dollars per share)     $ 1.67  
2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock available for future issuance (in shares)     3,906,242  
Additional shares authorized, maximum annual amount (in shares)     3,000,000 2,112,822
Additional shares authorized, maximum annual percentage     3.00%  
2019 Sales Team Plan | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares) 3,000,000      
Award expiration period 10 years      
Number of Shares        
Unvested end of period (in shares)     2,775,000  
Chief Financial Officer | Restricted stock awards        
Number of Shares        
Granted (in shares)   125,000    
Chief Financial Officer | Inducement Award [Member]        
Number of Options        
Granted (in shares)   125,000    
Weighted Average Exercise Price per Share        
Granted (in dollars per share)   $ 0.98    
Senior Vice President, Operations | Restricted stock awards        
Number of Shares        
Granted (in shares)   61,350    
Senior Vice President, Operations | Inducement Award [Member]        
Number of Options        
Granted (in shares)   66,667    
Weighted Average Exercise Price per Share        
Granted (in dollars per share)   $ 0.98