Goodwill and In-Process Research and Development  | 
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2018  | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Goodwill and Intangible Assets Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Goodwill and In-Process Research and Development | 
 5. Goodwill and In-Process Research and Development 
 A reconciliation of the beginning and ending goodwill for the years ended December 31, 2018 and 2017 is as follows (in thousands): 
 
 
 At December 31, 2018 and 2017, the Company had goodwill of $65,195,000 and determined the fair value of its reporting unit, measured by the Company’s Nasdaq market capitalization and an income approach analysis, exceeded the carrying value; therefore, management did not consider goodwill to be impaired. 
 A reconciliation of the beginning and ending in-process research and development intangible assets for the years ended December 31, 2018 and 2017 is as follows (in thousands): 
 
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