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Stockholders' Equity - Company's Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
OUTSTANDING OPTIONS    
Options granted 40,600  
WEIGHTED-AVERAGE EXERCISE PRICE    
Options granted | $ / shares $ 2.06  
2003 Stock Incentive Plan    
OUTSTANDING OPTIONS    
Outstanding at beginning of period 382,337  
Options exercised (121,056)  
Outstanding at end of period 261,281 382,337
WEIGHTED-AVERAGE EXERCISE PRICE    
Outstanding at beginning of period | $ / shares $ 1.33  
Options granted | $ / shares 1.12  
Outstanding at end of period | $ / shares $ 1.43 $ 1.33
VESTED AND EXPECTED TO VEST    
Weighted-Average Remaining Contractual Term 1 year 1 year 3 months 18 days
Aggregate Intrinsic Value (in thousands) | $ $ 608  
2013 Equity Incentive Plan    
OUTSTANDING OPTIONS    
Outstanding at beginning of period 4,399,606  
Options granted 1,473,100  
Options exercised 0  
Options forfeited (57,054)  
Outstanding at end of period 5,815,652 4,399,606
WEIGHTED-AVERAGE EXERCISE PRICE    
Outstanding at beginning of period | $ / shares $ 10.43  
Options granted | $ / shares 4.49  
Options forfeited | $ / shares 9.33  
Outstanding at end of period | $ / shares $ 8.93 $ 10.43
VESTED AND EXPECTED TO VEST    
Outstanding options 5,815,652  
Weighted-Average Exercise Price | $ / shares $ 8.93  
Weighted-Average Remaining Contractual Term 7 years 1 month 6 days  
Aggregate Intrinsic Value (in thousands) | $ $ 101  
ADDITIONAL DISCLOSURES    
Outstanding options exercisable at end of period 3,318,444  
Weighted-average exercise price exercisable at end of period | $ / shares $ 9.69  
Weighted-average contractual term (years) exercisable at end of period 5 years 8 months 12 days  
Weighted-average contractual term outstanding 7 years 1 month 6 days 6 years 9 months 18 days
Aggregate intrinsic value (in thousands) outstanding at end of period | $ $ 101