Balance Sheet Account Details Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]
Other receivables	$ 8,645	$ 7,857
Prepaid expenses	5,952	4,568
Income taxes receivable	0	2,560
Other	2,258	1,885
Total prepaid expenses and other current assets	$ 16,855	$ 16,870