Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 212,436,000	$ 64,030,000
Restricted cash	10,101,000	3,815,000
Short-term investments	1,258,000	1,749,000
Prepaid expenses	4,472,000	4,388,000
Accrued revenue, net of allowance for doubtful accounts of $150 and $147 at December 31, 2016 and September 30, 2017, respectively	13,336,000	10,625,000
Other current assets	5,623,000	8,781,000
Loans held for sale	726,000	0.00
Total current assets	247,952,000	93,388,000
Property and equipment, net	21,600,000	19,226,000
Intangible assets, net	3,416,000	3,782,000
Goodwill	9,186,000	9,186,000
Deferred offering costs	0	720,000
Other assets	6,931,000	7,175,000
Total assets:	289,085,000	133,477,000
Current liabilities:
Accounts payable	3,343,000	5,385,000
Accrued liabilities	30,202,000	22,253,000
Other payables	9,858,000	3,793,000
Loan facility	705,000	0
Current portion of deferred rent	1,104,000	1,512,000
Total current liabilities	45,212,000	32,943,000
Deferred rent, net of current portion	10,365,000	8,852,000
Total liabilities	55,577,000	41,795,000
Commitments and contingencies (Note 10)
Redeemable convertible preferred stock—par value $0.001 per share; As of December 31, 2016: 166,266,114 shares authorized; 55,422,002 issued and outstanding; and aggregate liquidation preference of $167,488. As of September 30, 2017: no shares authorized, issued, and outstanding.	0	655,416,000
Stockholders’ equity/(deficit):
Common stock—par value $0.001 per share; 290,081,638 and 500,000,000 shares authorized, respectively; 14,687,024 and 81,385,310 shares issued and outstanding, respectively	81,000	15,000
Preferred stock—par value $0.001 per share; As of December 31, 2016: no shares authorized, issued and outstanding. As of September 30, 2017: 10,000,000 shares authorized and no shares issued and outstanding.	0	0
Additional paid-in capital	360,631,000	0
Accumulated deficit	(127,204,000)	(563,749,000)
Total stockholders’ equity/(deficit)	233,508,000	(563,734,000)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity/(deficit):	$ 289,085,000	$ 133,477,000