Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 62,619	$ 64,928
Accounts receivable, net	38,689	31,625
Inventory	52,118	49,212
Prepaid expenses and other current assets	9,795	7,609
Total current assets	163,221	153,374
Property and equipment, net	59,458	60,262
Field equipment, net	23,446	24,264
Deferred cost of revenues	31,568	31,410
Intangible assets, net	7,154	7,660
Goodwill	42,748	42,748
Other assets	6,360	5,911
Total assets	333,955	325,629
Current liabilities:
Accounts payable	15,443	14,785
Accrued expenses	26,193	27,985
Current portion of long-term debt	105	101
Other current liabilities	4,716	4,559
Total current liabilities	46,457	47,430
Deferred revenues	47,205	46,874
Long-term debt	522	520
Other long-term liabilities	18,286	17,824
Total liabilities	112,470	112,648
Commitments and contingencies (Note 10)
Noncontrolling interests subject to put provisions	(171)	(165)
Stockholders’ equity:
Undesignated preferred stock: par value $0.001 per share, 5,000,000 shares authorized; no shares issued and outstanding as of March 31, 2018 and December 31, 2017	0	0
Common stock: par value $0.001 per share, 100,000,000 shares authorized; 67,561,597 and 67,341,819 shares issued as of March 31, 2018 and December 31, 2017, respectively	67	67
Additional paid-in capital	660,769	657,640
Accumulated deficit	(416,982)	(421,593)
Accumulated other comprehensive loss	(2,514)	(3,673)
Treasury stock, at cost: 1,074,909 and 1,046,870 shares as of March 31, 2018 and December 31, 2017, respectively	(19,957)	(19,283)
Total NxStage Medical, Inc. stockholders' equity	221,383	213,158
Noncontrolling interests not subject to put provisions	273	(12)
Total stockholders' equity	221,656	213,146
Total liabilities and stockholders’ equity	$ 333,955	$ 325,629

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.