Other Assets - Schedule of Other Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred manufacturing costs	$ 10,433	$ 7,338
Deposits	1,159	1,099
Long-term prepaid manufacturing costs	1,000	1,000
Deferred registration fees	140	140
Total other long-term assets	$ 12,732	$ 9,577