Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	[1]
Current assets:
Cash and cash equivalents	$ 68,499	$ 71,064
Short-term investments	173,436	185,480
Prepaid expenses and other current assets	3,080	2,321
Amounts owed by a related party	0	83
Total current assets	245,015	258,948
Long-term investments	1,201	3,181
Property and equipment, net	11,026	11,107
Equity investment in related party	770	1,202
Restricted cash	203	203
Other long-term assets	315	284
Total assets	258,530	274,925
Current liabilities
Accounts payable	2,829	3,102
Accrued liabilities	7,629	6,023
Deferred revenue, current	7,000	6,250
Other current liabilities	1,545	1,560
Total current liabilities	19,003	16,935
Deferred revenue, noncurrent	12,272	16,984
Deferred rent	4,145	4,272
Other long-term liabilities	1,543	1,792
Total liabilities	36,963	39,983
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of March 31, 2019 and December 31, 2018; no shares issued and outstanding as of March 31, 2019 and December 31, 2018	0
Common stock, $0.0001 par value, 400,000,000 shares authorized as of March 31, 2019 and December 31, 2018, respectively; 44,534,594 and 44,537,946 shares issued and outstanding as of March 31, 2019 and December 31, 2018 respectively	4	4
Additional paid-in capital	359,820	357,873
Accumulated deficit	(138,286)	(122,828)
Accumulated other comprehensive income (loss)	29	(107)
Total stockholders’ equity	221,567	234,942
Total liabilities, convertible preferred stock and stockholders’ equity	$ 258,530	$ 274,925

[1] The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.