CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 30,580	$ 28,975
Marketable securities	85,595	85,372
Accounts receivable, net of allowances of $2,994 and $3,619 as of March 31, 2017 and December 31, 2016, respectively	61,842	66,755
Inventory	16,509	15,070
Prepaid expenses and other current assets	6,210	5,137
Total current assets	200,736	201,309
Property and equipment, net	8,131	8,219
Goodwill and intangible assets	7,579	7,940
Other non-current assets	4,569	3,870
Total Assets	221,015	221,338
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	8,522	9,851
Accrued liabilities	29,887	31,525
Deferred revenue, current	58,780	61,334
Total current liabilities	97,189	102,710
Deferred revenue, non-current	34,325	31,574
Other non-current liabilities	912	988
Total Liabilities	132,426	135,272
Commitments and contingencies (Note 5)
Stockholders' Equity:
Common stock, par value $0.00001 - 500,000 shares authorized as of March 31, 2017 and December 31, 2016; 69,265 and 67,873 shares issued and outstanding as of March 31, 2017 and December 31, 2016	1	1
Additional paid-in-capital	335,493	328,869
Accumulated other comprehensive loss	(46)	(45)
Accumulated deficit	(246,859)	(242,759)
Total Stockholders' Equity	88,589	86,066
Total Liabilities and Stockholders' Equity	$ 221,015	$ 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.