CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 39,919	$ 28,975
Marketable securities	83,973	85,372
Accounts receivable, net of allowances of $2,240 and $3,619, respectively	49,856	66,755
Inventory	15,944	15,070
Prepaid expenses and other current assets	7,045	5,137
Total current assets	196,737	201,309
Property and equipment, net	9,531	8,219
Goodwill and intangible assets	6,858	7,940
Other non-current assets	4,837	3,870
Total assets	217,963	221,338
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	8,509	9,851
Accrued liabilities	27,604	31,525
Deferred revenue	59,294	61,334
Total current liabilities	95,407	102,710
Deferred revenue, non-current	31,710	31,574
Other non-current liabilities	1,073	988
Total liabilities	128,190	135,272
Commitments and contingencies (Note 5)
Stockholders' equity:
Common stock, $0.00001 par value: 500,000 shares authorized; 70,628 and 67,873 shares issued and outstanding, respectively	1	1
Additional paid-in-capital	347,573	328,869
Accumulated other comprehensive loss	(17)	(45)
Accumulated deficit	(257,784)	(242,759)
Total stockholders' equity	89,773	86,066
Total liabilities and stockholders' equity	$ 217,963	$ 221,338

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).

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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.