Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 143,228	$ 140,544
Short-term marketable securities		379,574	278,417
Accounts receivable		47,986	35,690
Inventory		15,181	9,136
Prepaid expenses and other current assets		11,389	5,204
Total current assets		597,358	468,991
Long-term marketable securities		268,783	77,563
Property and equipment, net		43,668	31,003
Right-of-use assets		29,140
Intangible assets, net		8,524	0
Goodwill		3,290	0
Capitalized license fees		6,890	7,800
Other assets		4,882	2,046
Total Assets	[1],[2]	962,535	587,403
Current liabilities:
Accounts payable		16,197	10,642
Accrued compensation		18,557	12,986
Accrued expenses		25,703	7,178
Deferred revenue		12,277	16,138
Total current liabilities		72,734	46,944
Long-term operating lease liabilities		33,256
Deferred rent, net of current portion		0	7,844
Obligation related to royalty		6,880	7,338
Other long-term liabilities		1,672	325
Total Liabilities	[1],[2]	114,542	62,451
Commitments and contingencies (Note 10)
Redeemable noncontrolling interest		49,600	41,800
Stockholders’ equity:
Preferred stock, par value of $0.00001 per share; 10,000,000 shares authorized, no shares issued and outstanding as of December 31, 2019 and 2018		0	0
Common stock, par value of $0.00001 per share; 350,000,000 and 350,000,000 shares authorized as of December 31, 2019 and 2018, respectively; 94,261,414 and 85,832,454 shares issued and outstanding as of December 31, 2019 and 2018, respectively		1	1
Additional paid-in capital		1,150,090	764,033
Accumulated other comprehensive gain (loss)		1,111	(83)
Accumulated deficit		(352,809)	(280,799)
Total Stockholders’ Equity		798,393	483,152
Total Liabilities, Redeemable Noncontrolling Interest and Stockholders’ Equity		$ 962,535	$ 587,403

[1] As of December 31, 2019 and 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 $5.7 million and $1.2 million of liabilities, respectively, of the consolidated VIE  of liabilities of consolidated VIE and VIE’s subsidiaries for which their creditors do not have recourse to the general credit of the Company. See Note 3, Investment in Joint Venture.

[2] Fiscal 2018 does not reflect the impact of the adoption of the new revenue accounting and lease accounting standards in fiscal year 2019.