Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 87,680	$ 59,702
Short-term investments	416,663	54,648
Accounts receivable—net of allowance for doubtful accounts of $638 and $617 at December 31, 2017 and 2016, respectively	60,676	38,984
Deferred commission expense	13,343	9,025
Restricted cash	4,757	162
Prepaid hosting costs	4,964	5,299
Prepaid expenses and other current assets	14,418	8,433
Total current assets	602,501	176,253
Long-term investments	31,394	35,718
Property and equipment, net	43,294	30,201
Capitalized software development costs, net	8,760	6,523
Restricted cash	347	321
Other assets	4,617	950
Intangible assets, net	6,312	16
Goodwill	14,950	9,773
Total assets	712,175	259,755
Current liabilities:
Accounts payable	4,657	4,350
Accrued compensation costs	16,329	11,415
Other accrued expenses	20,430	16,192
Deferred revenue	136,880	95,426
Total current liabilities	178,296	127,383
Deferred rent, net of current portion	18,868	10,079
Deferred revenue, net of current portion	2,277	1,171
Other long-term liabilities	3,927	2,422
Convertible senior notes	298,447
Total liabilities	501,815	141,055
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.001 par value—authorized, 500,000 shares; issued and outstanding, 37,503 and 35,784 at December 31, 2017 and 2016, respectively	38	36
Additional paid-in capital	496,461	365,444
Accumulated other comprehensive loss	(57)	(864)
Accumulated deficit	(286,082)	(245,916)
Total stockholders’ equity	210,360	118,700
Total liabilities and stockholders’ equity	$ 712,175	$ 259,755