Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities and Other Liabilities [Abstract]
Accrued employee compensation	$ 3,585	$ 2,125
Deferred rent	213	277
Accrued legal expense	334	265
Accrued consulting expense	134	139
Accrued vendor charges	692	932
Accrued revenue share expense	932	727
Accrued patent settlement and license costs	500	750
Accrued clinical trial expense	302	211
Accrued other	1,119	1,516
Total	$ 7,811	$ 6,942