Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 42,628	$ 39,775
Accounts receivable, net	55,746	80,392
Inventory	27,061	31,529
Prepaid expenses and other current assets	12,551	10,759
Total current assets	137,986	162,455
Property and equipment, net	14,808	15,681
Goodwill	116,175	116,175
Other assets	1,943	759
Total assets	270,912	295,070
Current liabilities:
Accounts payable	17,836	35,977
Accrued liabilities	48,783	49,279
Deferred revenue	14,676	13,076
Line of credit	30,000	30,000
Total current liabilities	111,295	128,332
Long-term portion of deferred revenue	20,712	20,645
Other long-term liabilities	866	1,130
Total liabilities	132,873	150,107
Commitments and contingencies (See Note 7)
Stockholders’ equity:
Preferred stock, $0.025 par value; 5,000 shares authorized; no shares issued and outstanding as of March 31, 2018 and December 31, 2017	0	0
Common stock, $0.025 par value; 100,000 shares authorized; 57,047 shares issued and 51,717 shares outstanding as of March 31, 2018, and 56,839 shares issued and 51,509 shares outstanding as of December 31, 2017	1,426	1,421
Additional paid-in capital	853,809	851,054
Accumulated other comprehensive income (loss)	110	(169)
Accumulated deficit	(677,320)	(667,357)
Treasury stock, 5,330 shares as of March 31, 2018 and December 31, 2017	(39,986)	(39,986)
Total stockholders’ equity	138,039	144,963
Total liabilities and stockholders’ equity	$ 270,912	$ 295,070

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.