Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Reagents	$ 260	$ 322
Prepaid expenses	810	375
Prepaid income taxes	1,053
Marketable securities interest receivable	210	209
Other receivable	63
Total	$ 2,396	$ 906