UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 10,686,196	$ 11,063,010
Cost of revenue	8,546,232	8,720,125
Gross profit	2,139,964	2,342,885
Operating expenses
Selling, general and administration	2,877,309	2,878,942
Acquisition related expenses	0	10,000
Depreciation and amortization	561,017	820,736
Operating expenses	3,438,326	3,709,678
Operating (loss)	(1,298,362)	(1,366,793)
Interest expense	(142,554)	(211,159)
Changes in fair value of warrant liability	(450,267)	0
Others, net	0	6,199
Total other income (expenses)	(592,821)	(204,960)
(Loss) before income taxes	(1,891,183)	(1,571,753)
Tax benefit / (provision)	31,211	0
(Loss) after income taxes	(1,859,972)	(1,571,753)
Dividend on preferred stock	(105,705)	(557,417)
Net (loss) attributable to common stock holders	(1,965,677)	(2,129,170)
Other comprehensive income/ (loss), net of tax:
Foreign exchange translation	18,714	29,791
Comprehensive (loss)	$ (1,946,963)	$ (2,099,379)
Basic income (loss) per share (in dollars per share)	$ (0.04)	$ (0.11)
Diluted income (loss) per share (in dollars per share)	$ (0.04)	$ (0.11)
Basic weighted average number of common shares outstanding (in shares)	45,185,080	18,654,197
Diluted weighted average number of common shares outstanding (in shares)	45,185,080	18,654,197