Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 94,569	$ 67,360
U.S. Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 168,200
Net operating loss carryforward expiration year	2027
California
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 168,200
Net operating loss carryforward expiration year	2028