Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Loss per Share (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Loss per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
EPS Numerator:                      
Net loss $ (17,200) $ (11,490) $ (20,606) $ (17,598) $ 3,228 $ (23,766) $ (25,557) $ (24,385) $ (66,894) $ (70,480) $ (77,992)
EPS Denominator - Basic and Diluted:                      
Weighted-average common shares outstanding                 167,400 160,529 126,324
Net loss per common share:                      
Basic and diluted (in dollars per share) $ (0.10) $ (0.07) $ (0.12) $ (0.11) $ 0.02 $ (0.14) $ (0.16) $ (0.17) $ (0.40) $ (0.44) $ (0.62)
Weighted Average                      
Net loss per common share:                      
Weighted average exercise price of options (in dollars per share) $ 3.51       $ 4.20       $ 3.51 $ 4.20 $ 5.45
Employee stock option                      
Net loss per common share:                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 22,671 20,713 20,408