Annual report pursuant to Section 13 and 15(d)

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

v3.7.0.1
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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
EPS Numerator:                      
Net loss $ (15,590) $ (22,629) $ (13,533) $ (17,464) $ (12,687) $ (6,672) $ (13,912) $ (18,193) $ (69,216) $ (51,464) $ (90,908)
EPS Denominator - Basic and Diluted:                      
Weighted average common shares outstanding 98,981 95,454 92,495 90,555 89,038 88,506 88,137 88,043 94,387 88,434 87,662
Net loss per common share:                      
Basic and diluted (in dollars per share) $ (0.16) $ (0.24) $ (0.15) $ (0.19) $ (0.14) $ (0.08) $ (0.16) $ (0.21) $ (0.73) $ (0.58) $ (1.04)
Weighted Average                      
Net loss per common share:                      
Weighted average exercise price of options (in dollars per share) 6.25       7.08       6.25 7.08 9.07
Weighted average exercise price of warrant (in dollars per share) $ 6.61       $ 6.61       $ 6.61 $ 6.61 $ 6.61
Employee stock option                      
Net loss per common share:                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 20,257 19,106 16,971
Warrant to purchase common stock                      
Net loss per common share:                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 32 200 200