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Stockholders' Equity - Company's Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
2003 Stock Incentive Plan    
OUTSTANDING OPTIONS    
Outstanding at beginning of period 382,337  
Options exercised (116,046)  
Outstanding at end of period 266,291 382,337
WEIGHTED-AVERAGE EXERCISE PRICE    
Outstanding at beginning of period $ 1.33  
Options exercised 1.12  
Outstanding at end of period $ 1.43 $ 1.33
VESTED AND EXPECTED TO VEST    
Weighted-Average Remaining Contractual Term 1 year 2 months 12 days 1 year 3 months 18 days
Aggregate Intrinsic Value (in thousands) $ 228  
2013 Equity Incentive Plan    
OUTSTANDING OPTIONS    
Outstanding at beginning of period 4,399,606  
Options granted 1,334,700  
Options exercised 0  
Options forfeited (26,065)  
Outstanding at end of period 5,708,241 4,399,606
WEIGHTED-AVERAGE EXERCISE PRICE    
Outstanding at beginning of period $ 10.43  
Options granted 4.64  
Options forfeited 9.11  
Outstanding at end of period $ 9.08 $ 10.43
VESTED AND EXPECTED TO VEST    
Outstanding options 5,708,241  
Weighted-Average Exercise Price $ 9.08  
Weighted-Average Remaining Contractual Term 7 years 3 months 18 days  
ADDITIONAL DISCLOSURES    
Outstanding options exercisable at end of period 3,032,134  
Weighted-average exercise price exercisable at end of period $ 9.44  
Weighted-average contractual term (years) exercisable at end of period 5 years 8 months 12 days  
Weighted-average contractual term outstanding 7 years 3 months 18 days 6 years 9 months 18 days