Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 69,429	$ 70,791
Accounts receivable, net	67,083	50,573
Inventories, net	115,635	113,853
Prepaid expenses and other current assets	7,937	5,512
Total current assets	260,084	240,729
Property, plant and equipment, net	31,486	30,840
Long-term restricted cash	6,792	6,864
Other assets	24,245	23,798
Total assets	322,607	302,231
Current liabilities:
Accounts payable	26,426	24,996
Accrued compensation	5,920	5,142
Warranty	2,748	2,426
Income taxes	252	240
Deferred revenue	12,179	10,335
Other current liabilities	5,310	4,592
Total current liabilities	52,835	47,731
Sale leaseback obligation	47,681	47,586
Long-term deferred revenue	942	674
Other long-term liabilities	4,906	4,785
Total liabilities	106,364	100,776
Stockholders' equity:
Common stock, $0.001 par value, 75,000 shares authorized; 29,995 shares issued and outstanding at March 31, 2017; 29,518 shares issued and outstanding at December 31, 2016	30	30
Additional paid-in capital	538,747	535,408
Accumulated deficit	(322,198)	(331,704)
Accumulated other comprehensive loss	(336)	(2,279)
Total stockholders' equity	216,243	201,455
Total liabilities and stockholders' equity	$ 322,607	$ 302,231

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.