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Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Cash and Cash Equivalents

Cash and cash equivalents consisted of the following (in thousands):

		June 30, 2019				December 31, 2018
Cash		$	40,783			$	38,783
US treasury notes and bills			—				49,934
Money market funds			33,804				541
Total cash and cash equivalents		$	74,587			$	89,258

Summary of Amortized Cost, Gross Unrealized Holding Gains or Losses, and Fair Value of Available-for-Sale Investments

The Company’s investments consist of available-for-sale debt investments, marketable equity investments, a term deposit and a certificate of deposit. The amortized cost, gross unrealized holding gains or losses, and fair value of the Company’s available-for-sale investments by major investments type are summarized in the tables below (in thousands):

		June 30, 2019
		Amortized Cost				Gross Unrealized Holding Gains				Gross Unrealized Holding Losses				Fair Value
US treasury notes and bills		$	475,126			$	1,028			$	—			$	476,154
Term deposit			80,000				—				—				80,000
Certificates of deposit			30,000				21				—				30,021
Bond and mutual funds			10,602				75				—				10,677
Equity investments			125				112				—				237
Total investments		$	595,853			$	1,236			$	—			$	597,089
		December 31, 2018
		Amortized Cost				Gross Unrealized Holding Gains				Gross Unrealized Holding Losses				Fair Value
US treasury notes and bills		$	467,296			$	109			$	(69	)		$	467,336
Term deposit			80,000				—				—				80,000
Certificates of deposit			30,000				—				(90	)			29,910
Bond and mutual funds			10,464				20				—				10,484
Equity investments			125				109				—				234
Total investments		$	587,885			$	238			$	(159	)		$	587,964

Schedule of Inventory

Inventories consisted of the following (in thousands):

		June 30, 2019
Raw materials		$	797
Work-in-progress			1,035
Finished goods			149
Total inventories		$	1,981

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

		June 30, 2019				December 31, 2018
Unbilled contract assets		$	180,000			$	—
Deferred revenues from associated contracts			(52,019	)			—
Net unbilled contract assets			127,981				—
Prepaid assets			4,716				2,705
Other current assets			3,899				2,224
Total prepaid expenses and other current assets		$	136,596			$	4,929

Schedule of Property and Equipment

Property and equipment consisted of the following (in thousands):

		June 30, 2019				December 31, 2018
Leasehold improvements		$	101,250			$	101,200
Building shell			—				53,880
Laboratory equipment			16,754				16,405
Machinery			8,461				8,382
Computer equipment			6,655				6,473
Furniture and fixtures			5,778				5,690
Construction in progress			1,888				367
Total property and equipment		$	140,786			$	192,397
Less: accumulated depreciation			(95,921	)			(65,199	)
Property and equipment, net		$	44,865			$	127,198

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

		June 30, 2019				December 31, 2018
Preclinical and clinical trial accruals		$	41,104			$	35,413
Payroll and related accruals			14,001				21,430
Property taxes and other			1,778				1,095
Professional services			3,588				2,648
Other			6,074				5,537
Total accrued liabilities		$	66,545			$	66,123

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