Balance Sheet Accounts - Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Advances to commercial manufacturers	$ 2,462	$ 2,700
Prepaid FDA user fee	6,345	1,540
Prepaid insurance	191	150
Prepaid income taxes	4,661	5,739
All other	1,445	134
Total Prepaid expenses and other current assets	$ 15,104	$ 10,263

Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_PrepaidTaxes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant