Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 148,716	$ 133,407
Short-term restricted cash		750
Accounts receivable, net	84,977	75,302
Inventories, net	124,008	120,544
Prepaid expenses and other current assets	9,582	9,772
Total current assets	367,283	339,775
Property, plant and equipment, net	37,659	36,168
Long-term restricted cash	6,877	6,723
Deferred income taxes	76,382	83,148
Other assets	31,031	22,404
Total assets	519,232	488,218
Current liabilities:
Accounts payable	27,930	32,642
Accrued compensation	14,261	20,955
Warranty	4,545	4,112
Income taxes	205	273
Deferred revenue	14,393	16,181
Other current liabilities	4,938	5,124
Total current liabilities	66,272	79,287
Sale leaseback obligation	47,746	47,714
Long-term deferred revenue	3,381	1,964
Other long-term liabilities	4,759	5,643
Total liabilities	122,158	134,608
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.001 par value, 75,000 shares authorized; 32,398 shares issued and outstanding at September 30, 2018; 32,048 shares issued and outstanding at December 31, 2017	32	32
Additional paid-in capital	562,083	556,147
Accumulated deficit	(165,723)	(204,745)
Accumulated other comprehensive income	682	2,176
Total stockholders' equity	397,074	353,610
Total liabilities and stockholders' equity	$ 519,232	$ 488,218

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.