Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows From Operating Activities:
Net loss attributable to the Company	$ (30,490)	$ (81,331)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment, and investment in leased property	1,481	1,438
Amortization of intangible assets	835	1,783
Stock-based compensation	5,835	2,403
Loss (gain) on acquisition activity, net	116	(1,014)
Gain on disposal of property, plant and equipment		(32)
Change in fair value of common stock warrant liability	(4,603)	58,371
Changes in operating assets and liabilities that provide (use) cash, net of effects of acquisitions:
Accounts receivable	(1,536)	(8,288)
Inventory	(6,301)	(6,358)
Prepaid expenses and other assets	(8,127)	(5,730)
Note receivable	48	47
Accounts payable, accrued expenses, product warranty reserve and other liabilities	5,325	6,031
Deferred revenue	121	1,655
Net cash used in operating activities	(37,296)	(31,025)
Cash Flows From Investing Activities:
Purchase of property, plant and equipment	(2,902)	(1,200)
Cash acquired in purchase acquisitions	1,811	414
Proceeds from disposal of property, plant and equipment		32
Net cash used in investing activities	(1,091)	(754)
Cash Flows From Financing Activities:
Change in restricted cash	(29,686)
Proceeds from exercise of warrants	25	18,340
Purchase of treasury stock		(514)
Proceeds from issuance of common stock and warrants		176,700
Stock issuance costs		(10,977)
Proceeds from exercise of stock options	166	241
Principal payments on obligations under capital lease	(587)	(576)
Proceeds from lease agreements recognized as finance obligations	7,224
Net cash (used in) provided by financing activities	(22,858)	183,214
Effect of exchange rate changes on cash	49
(Decrease) increase in cash and cash equivalents	(61,196)	151,435
Cash and cash equivalents, beginning of period	146,205	5,027
Cash and cash equivalents, end of period	85,009	156,462
Other Supplemental Cash Flow Information:
Cash paid for interest	303	$ 337
Issuance of common stock for acquisition of HyPulsion	$ 11,474