Annual report pursuant to Section 13 and 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities Current Line Items [Line Items]    
Salaries, benefits and incentive compensation $ 1,981 $ 3,007
Milestone payment to licensor 1,000 1,000
Professional fees 538 692
Royalty fees 227 197
Deferred revenue 365 181
Other 159 147
Total accrued expenses and other current liabilities $ 4,270 $ 5,224