Condensed consolidated balance sheets - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 1,253,641	$ 1,644,535
Pledged deposits	10,477,507	9,104,178
Trade accounts and bills receivable, net	44,312,579	57,518,612
Inventories	11,605,408	9,832,405
Prepayments and other receivables	7,157,606	6,971,810
Prepaid land use rights, current portion	179,049	172,700
Total current assets	74,985,790	85,244,240
Property, plant and equipment, net	35,840,227	34,965,510
Construction in progress	29,840,338	25,029,290
Prepaid land use rights, non-current	8,116,882	7,872,235
Intangible assets, net	20,078	20,049
Total assets	148,803,315	153,131,324
Current liabilities
Trade accounts and bills payable	60,290,058	65,616,543
Other short-term loans	17,848,019	14,636,450
Accrued expenses and other payables	14,102,123	14,208,947
Payables to former subsidiaries, net	21,321,988	22,302,721
Deferred government grants, current	157,591	152,003
Total current liabilities	113,719,779	116,916,664
Long-term bank loans	20,206,205	19,489,702
Deferred government grants, non-current	4,845,963	4,712,128
Product warranty provision	2,369,827	2,279,831
Long term tax payable	7,814,367	7,537,273
Total liabilities	148,956,141	150,935,598
Commitments and contingencies	0	0
Shareholders' equity (deficit)
Common stock $0.001 par value; 500,000,000 authorized ; 26,367,523 issued and 26,223,317 outstanding as of December 31, 2017, 26,376,023 issued and 26,231,817 outstanding as of March 31, 2018	26,377	26,368
Donated shares	14,101,689	14,101,689
Additional paid-in capital	155,794,578	155,711,014
Statutory reserves	1,230,511	1,230,511
Accumulated deficit	(166,034,546)	(163,466,713)
Accumulated other comprehensive loss	(1,204,825)	(1,340,533)
Shareholders' equity before treasury stock	3,913,784	6,262,336
Less: Treasury shares	(4,066,610)	(4,066,610)
Total shareholders' equity (deficit)	(152,826)	2,195,726
Total liabilities and shareholder's equity	$ 148,803,315	$ 153,131,324