Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 273,064	$ 75,816
Accounts receivable	6,454	1,000
Prepaid expenses and other current assets	1,788	810
Total current assets	281,306	77,626
Property and equipment, net	10,628	2,708
Other assets	7,035	1,805
Total Assets	298,969	82,139
Current Liabilities:
Accounts payable	4,652	1,360
Accrued expenses	5,900	2,788
Current portion of deferred revenue	20,178	6,547
Total current liabilities	30,730	10,695
Deferred revenue, net of current portion	58,109	3,765
Other long-term liabilities	293	323
Commitments and contingencies (Note 6)
Convertible preferred stock, $0.0001 par value; 5,000,000 shares and 36,500,000 shares authorized, respectively; 0 shares and 36,316,628 shares issued and outstanding, respectively		88,557
Stockholders' Equity (Deficit):
Common stock, $0.0001 par value; 120,000,000 shares and 50,000,000 shares authorized, respectively; 36,018,540 shares issued and outstanding and 2,558,755 shares issued and outstanding, respectively	4
Additional paid-in capital	263,403	735
Accumulated deficit	(53,570)	(21,936)
Total stockholders' equity (deficit)	209,837	(21,201)
Total Liabilities and Stockholders' Equity (Deficit)	$ 298,969	$ 82,139