Income Taxes - Schedule of Reconciliation of Theoretical Tax Expense and Actual Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Loss before taxes, as reported in the consolidated statements of operations	$ (76,376)	$ (28,165)	$ (11,057)
Statutory tax rate	21.00%	21.00%	34.00%
Theoretical tax benefits on the above amount at the US statutory tax rate	$ (16,039)	$ (5,915)	$ (3,759)
Income tax at rate other than the U.S. statutory tax rate	(2,508)	692	(1,047)
Tax advances and non-deductible expenses including equity based compensation expenses	(115)	(7,623)	3,123
Operating losses and other temporary differences for which valuation allowance was provided	22,818	15,826	(8,623)
Research and Development Tax Credit	0	0	1,126
State tax	(3,436)	(1,221)	(601)
Impact of rate change	401	0	10,920
Change in tax reserve for uncertain tax positions	1,247	(1,728)	1,576
Other individually immaterial income tax items	20	382	72
Income tax expense	$ 2,388	$ 413	$ 2,787