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Balance Sheet Components (Tables)

9 Months Ended

Sep. 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):

		September 30, 2019				December 31, 2018
Cash		$	90,770			$	38,783
US treasury notes and bills			—				49,934
Money market funds			105,822				541
Total cash and cash equivalents		$	196,592			$	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):

		September 30, 2019
		Amortized Cost				Gross Unrealized Holding Gains				Gross Unrealized Holding Losses				Fair Value
US treasury notes and bills		$	401,377			$	688			$	(25	)		$	402,040
Certificates of deposit			30,000				—				—				30,000
Bond and mutual funds			10,668				80				—				10,748
Equity investments			125				126				—				251
Total investments		$	442,170			$	894			$	(25	)		$	443,039
		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):

		September 30, 2019
Raw materials		$	658
Work-in-progress			1,155
Finished goods			3,095
Total inventories		$	4,908

Schedule of Prepaid Expenses and Other Current Assets

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

		September 30, 2019				December 31, 2018
Unbilled contract assets		$	180,000			$	—
Deferred revenues from associated contracts			(53,988	)			—
Net unbilled contract assets			126,012				—
Prepaid assets			4,051				2,705
Other current assets			3,652				2,224
Total prepaid expenses and other current assets		$	133,715			$	4,929

Schedule of Property and Equipment

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

		September 30, 2019				December 31, 2018
Leasehold improvements		$	101,339			$	101,200
Building shell			—				53,880
Laboratory equipment			16,932				16,405
Machinery			8,691				8,382
Computer equipment			7,227				6,473
Furniture and fixtures			5,789				5,690
Construction in progress			2,332				367
Total property and equipment		$	142,310			$	192,397
Less: accumulated depreciation			(99,102	)			(65,199	)
Property and equipment, net		$	43,208			$	127,198

Schedule of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

		September 30, 2019				December 31, 2018
Preclinical and clinical trial accruals		$	41,546			$	35,413
Payroll and related accruals			17,604				21,430
Property taxes and other			2,389				1,095
Professional services			4,063				2,648
Other			5,223				5,537
Total accrued liabilities		$	70,825			$	66,123

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