Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 888	$ 1,234
Deposits	357	364
Tradable equity securities	2,362	5,069
Derivative asset (Note 6)	3,482	3,121
Other current assets	1,056	1,510
Total prepaid expenses and other current assets	$ 8,145	$ 11,298