Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 253,026	$ 27,210
Short-term investments	34,125	0
Accounts receivable (net of allowance for doubtful accounts of $196 and $160 at September 30, 2018 and December 31, 2017, respectively)	59,035	50,881
Deferred commissions	20,401	17,170
Prepaid expenses and other current assets	14,718	15,994
Total current assets	381,305	111,255
Property and equipment, net	10,872	10,754
Construction in progress	23,546	2,252
Deferred commissions (net of current portion)	32,483	33,006
Intangible assets, net	578	1,031
Goodwill	265	265
Other assets	5,149	5,774
Total assets	454,198	164,337
Current liabilities:
Accounts payable	538	338
Accrued expenses	6,570	4,878
Accrued compensation	19,734	18,482
Deferred revenue	191,578	154,898
Other current liabilities	1,897	1,750
Total current liabilities	220,317	180,346
Deferred revenue (net of current portion)	74,120	70,920
Financing obligation	23,096	1,802
Other liabilities	4,104	5,199
Total liabilities	321,637	258,267
Commitments and contingencies (Note 5)
Stockholders’ equity (deficit):
Common stock (par value: $0.01; 500,000 and 93,855 shares authorized at September 30, 2018 and December 31, 2017; 93,040 and 24,472 shares issued and outstanding at September 30, 2018 and December 31, 2017)	930	246
Additional paid-in capital	578,125	20,676
Accumulated deficit	(446,494)	(392,587)
Total stockholders’ equity (deficit)	132,561	(371,665)
Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit)	454,198	164,337
Series A Redeemable Convertible Preferred Stock
Current liabilities:
Redeemable convertible preferred stock	0	49,935
Series B Redeemable Convertible Preferred Stock
Current liabilities:
Redeemable convertible preferred stock	$ 0	$ 227,800

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682