Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 58,459	$ 59,065
Accounts receivable, net	30,092	25,195
Inventory	41,309	38,391
Prepaid expenses and other current assets	5,921	6,254
Total current assets	135,781	128,905
Property and equipment, net	66,374	66,711
Field equipment, net	20,978	20,744
Deferred cost of revenues	34,065	33,068
Intangible assets, net	10,714	11,744
Goodwill	42,710	42,710
Other assets	3,074	2,992
Total assets	313,696	306,874
Current liabilities:
Accounts payable	13,583	10,767
Accrued expenses	26,616	27,266
Current portion of long-term debt	324	315
Other current liabilities	4,452	4,394
Total current liabilities	44,975	42,742
Deferred revenues	52,280	51,362
Long-term debt	1,602	1,664
Other long-term liabilities	16,911	17,367
Total liabilities	115,768	113,135
Commitments and contingencies
Noncontrolling interests subject to put provisions	168	219
Stockholders’ equity:
Undesignated preferred stock: par value $0.001, 5,000,000 shares authorized; no shares issued and outstanding as of June 30, 2016 and December 31, 2015	0	0
Common stock: par value $0.001, 100,000,000 shares authorized; 65,443,862 and 64,873,038 shares issued as of June 30, 2016 and December 31, 2015, respectively	65	64
Additional paid-in capital	621,395	612,487
Accumulated deficit	(405,838)	(402,830)
Accumulated other comprehensive loss	(4,250)	(4,031)
Treasury stock, at cost: 901,013 and 822,059 shares as of June 30, 2016 and December 31, 2015, respectively	(15,334)	(13,864)
Total NxStage Medical, Inc. stockholders' equity	196,038	191,826
Noncontrolling interests not subject to put provisions	1,722	1,694
Total stockholders' equity	197,760	193,520
Total liabilities and stockholders’ equity	$ 313,696	$ 306,874

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.