Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 13,167,036	$ 18,474,211
Other current assets	1,275,714	1,207,072
Prepaid expenses	507,390	109,332
Income tax receivable	15,232	14,810
Total current assets	14,965,372	19,805,425
Property and equipment, net	1,785,789	2,052,221
Deferred tax asset	23,541	26,522
Total assets	16,774,702	21,884,168
Current liabilities:
Trade accounts payable	1,539,706	1,260,015
Accrued expenses	413,395	743,866
Other current liabilities	274,255	242,755
Bank loan, including accrued interest		1,270,605
Deferred tax liabilities	23,541	26,522
Total current liabilities	2,250,897	3,543,763
Accrued expenses, non-current	296,452	333,988
Total liabilities	2,547,349	3,877,751
Stockholders' equity
Common stock, $0.001 par value per share, 300,000,000 shares authorized and 29,429,522 and 29,279,522 issued and outstanding at March 31, 2015 and December 31, 2014	29,430	29,280
Additional paid-in capital	85,155,534	84,627,283
Accumulated other comprehensive loss	(1,445,829)	(843,097)
Accumulated deficit	(69,511,782)	(65,807,048)
Total stockholders' equity	14,227,353	18,006,417
Total liabilities and stockholders' equity	$ 16,774,702	$ 21,884,168