Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities:
Net loss attributable to the Company	$ (55,690)	$ (88,488)	$ (62,670)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment, and leased property under capital lease	2,006	1,946	1,908
Amortization of intangible assets	981	2,391	2,271
Stock-based compensation	7,817	4,157	2,181
Gain on sale of equity interest in joint venture			(3,235)
Loss (gain) on acquisition activity, net	116	(1,014)
Loss on disposal of property, plant and equipment		78	66
Provision for loss contracts related to service	10,050
Change in fair value of common stock warrant liability	(3,661)	52,260	37,102
Changes in operating assets and liabilities that provide (use) cash, net of effects of acquisitions:
Accounts receivable	(5,638)	(9,350)	(2,408)
Inventory	(7,251)	(9,168)	(1,856)
Prepaid expenses and other assets	(11,656)	(7,219)	137
Note receivable	64	63	61
Accounts payable, accrued expenses, product warranty reserve and other liabilities	7,214	10,818	(2,140)
Deferred revenue	8,374	2,746	1,702
Net cash used in operating activities	(47,274)	(40,780)	(26,881)
Cash Flows From Investing Activities:
Proceeds from sale of equity interest in joint venture			3,235
Purchase of property, plant and equipment	(3,520)	(1,413)	(111)
Net cash acquired in purchase acquisitions	1,496	414
Proceeds from disposal of property, plant and equipment		34	84
Net cash (used in) provided by investing activities	(2,024)	(965)	3,208
Cash Flows From Financing Activities:
Change in restricted cash	(47,335)		(500)
Proceeds from exercise of warrants	25	18,340	6,103
Proceeds from issuance of preferred stock			2,595
Preferred stock issuance costs			(224)
Purchase of treasury stock	(247)	(603)
Proceeds from issuance of common stock and warrants		176,700	14,808
Common stock issuance costs		(10,977)	(1,934)
Repayment of borrowings under line of credit			(3,381)
Proceeds from exercise of stock options	167	240
Principal payments on obligations under capital lease	(587)	(777)	(699)
Proceeds from lease agreements recognized as finance obligations	15,054		2,600
Net cash (used in) provided by financing activities	(32,923)	182,923	19,368
Effect of exchange rate changes on cash	(23)		(48)
(Decrease) increase in cash and cash equivalents	(82,244)	141,178	(4,353)
Cash and cash equivalents, beginning of period	146,205	5,027	9,380
Cash and cash equivalents, end of period	63,961	146,205	5,027
Other Supplemental Cash Flow Information:
Cash paid for interest	553	433	$ 475
Noncash investing activity - issuance of common stock for acquisitions	$ 14,459	$ 4,000