XML 53 R42.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt - Summary of Composition of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Outstanding principal $ 30,000 $ 30,000
Accrued final payment fees 1,286 940
Less debt discounts (1,289) (1,384)
Total long-term debt, net 29,997 29,556
Less current portion of long-term debt (2,500)  
Long-term debt, net $ 27,497 $ 29,556