Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 147,188	$ 140,544
Short-term marketable securities		375,768	278,417
Accounts receivable		39,689	35,690
Inventory		14,760	9,136
Prepaid expenses and other current assets		5,657	5,204
Total current assets		583,062	468,991
Long-term marketable securities		302,624	77,563
Property and equipment, net		40,759	31,003
Intangible assets		8,755	0
Goodwill		2,928	0
Capitalized license fees		7,133	7,800
Other assets		3,073	2,046
Total Assets	[1]	948,334	587,403
Current liabilities:
Accounts payable		12,054	10,642
Accrued compensation		24,604	12,986
Accrued expenses		17,239	7,081
Capital lease, current		80	97
Deferred rent, current		745	0
Deferred revenue		13,095	16,138
Total current liabilities		67,817	46,944
Capital lease, net of current portion		57	119
Deferred rent, net of current portion		10,564	7,844
Obligation related to royalty		6,780	7,338
Other long-term liabilities		1,220	206
Total Liabilities	[1]	86,438	62,451
Commitments and contingencies (Note 8)
Redeemable noncontrolling interest		46,500	41,800
Stockholders’ equity:
Common stock, par value of $0.00001 per share; 350,000,000 shares authorized as of September 30, 2019 and December 31, 2018; 93,853,390 and 85,832,454 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively		1	1
Additional paid-in capital		1,141,885	764,033
Accumulated other comprehensive loss		1,109	(83)
Accumulated deficit		(327,599)	(280,799)
Total Stockholders’ Equity		815,396	483,152
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity		$ 948,334	$ 587,403

[1] As of September 30, 2019 and December 31, 2018, includes $45.1 million and $48.3 million of assets, respectively, that can be used only to settle obligations of the consolidated variable interest entity (“VIE”) and VIE’s subsidiaries, and $3.0 million and $1.2 million of liabilities of the consolidated VIE and VIE’s subsidiaries, respectively, for which their creditors do not have recourse to the general credit of the Company. See Note 3.