Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses and Other Current Liabilities (Details)

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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accrued Liabilities Current Line Items [Line Items]    
Salaries, benefits and incentive compensation $ 2,386 $ 1,981
Milestone payment to licensor 1,000 1,000
Professional fees 841 538
Royalty fees 266 227
Deferred revenue 407 365
Other 225 159
Total accrued expenses and other current liabilities $ 5,125 $ 4,270