Condensed Consolidated Balance Sheets(USD ($)) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 96,307	$ 156,540
Restricted cash	30,999	337
Bank deposits with maturity over three months	5,323	8,852
Short-term investments	27,424	27,354
Accounts receivable, net of allowance for doubtful accounts of $766 and $766, respectively	23,089	22,654
Costs and estimated earnings in excess of billings on uncompleted contracts	85,075	73,742
Inventories, net	8,206	6,975
Project assets	107,354	73,930
Prepaid expenses and other current assets	38,527	10,930
Other receivable, related parties	4,723
Finance lease receivable	2,052
Total current assets	429,079	381,314
Intangible assets	517	560
Goodwill	67,462	66,045
Restricted cash, net of current portion		160
Accounts receivable, noncurrent	3,667	4,490
Notes receivable, noncurrent	6,611	6,611
Property, plant and equipment net	108,892	106,438
Project assets, noncurrent	32,014	21,265
Deferred tax assets, net	1,123	1,024
Financing receivable, noncurrent	107
Total assets	649,472	587,907
Current liabilities:
Accounts payable	90,789	76,778
Accounts payable, related parties	30,667	34,150
Notes payable	46,814	26,707
Accrued liabilities	22,681	11,288
Income taxes payable	5,378	3,648
Advance from customers	18,951	17,690
Short term borrowings	61,637	48,286
Other current liabilities	29,512	33,762
Other current liabilities, related parties	934
Total current liabilities	307,363	252,309
Financing and capital lease obligations	9,956	10,092
Convertible bonds	32,987	32,575
Deferred tax liability, net	3,233	3,680
Other noncurrent liabilities	25,914	27,143
Total liabilities	379,453	325,799
Commitments and contingencies
Stockholders' equity:
Preferred stock, par $0.0001, 20,000,000 shares authorized; none issued and outstanding
Common stock, par $0.0001, 1,000,000,000 shares authorized; 601,270,944 and 568,847,967 shares issued and outstanding, respectively	60	57
Additional paid in capital	380,739	327,573
Accumulated other comprehensive loss	(13,291)	(4,252)
Accumulated deficit	(98,722)	(61,270)
Total stockholders' equity	268,786	262,108
Noncontrolling interests	1,233
Total equity	270,019	262,108
Total liabilities and stockholders' equity	$ 649,472	$ 587,907