Balance Sheet Details (Schedule of Accounts Payable and Accrued Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance Sheet Related Disclosures [Abstract]
Accounts payable	$ 4,675	$ 17,842
Income tax payable	348	415
Accrued warranty	944	1,315	$ 910
Consigned inventory liability	7,078	0
Other accrued liabilities	3,468	7,711
Total accounts payable and accrued liabilities	$ 16,513	$ 27,283