UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) [Abstract]
Revenue	$ 10,576,254	$ 12,529,928	$ 32,715,104	$ 37,139,114
Cost of revenue	8,230,456	9,966,490	25,637,422	28,941,535
Gross profit	2,345,798	2,563,438	7,077,682	8,197,579
Operating expenses
Selling general and administration	2,655,902	5,685,905	8,059,432	13,559,632
Acquisition related expenses	227,952	5,694	237,952	390,174
Depreciation and amortization	636,495	817,284	2,266,513	2,332,041
Change in estimate for consideration payable	(7,274,929)	0	(7,140,310)	(400,000)
Operating expenses	(3,754,580)	6,508,883	3,423,587	15,881,847
Operating income (loss)	6,100,378	(3,945,445)	3,654,095	(7,684,268)
Interest expenses	(190,394)	(132,973)	(584,074)	(388,122)
Changes in fair value of warrant liability	(261,330)	0	(261,330)	0
Others, net	75,747	17,446	83,736	21,921
Income (loss) before income taxes	5,724,401	(4,060,972)	2,892,427	(8,050,469)
Tax benefit / (provision)	(24,934)	0	(24,934)	0
Net income (loss)	5,699,467	(4,060,972)	2,867,493	(8,050,469)
Net income attributable to non-controlling interest	0	(6,632)	0	(18,504)
Net income (loss) attributable to the Company	5,699,467	(4,067,604)	2,867,493	(8,068,973)
Dividend on preferred stock	(1,816,452)	(541,864)	(2,478,005)	(1,546,655)
Net income (loss) attributable to common stockholders	3,883,015	(4,609,468)	389,488	(9,615,628)
Other comprehensive income (loss), net of tax
Foreign exchange translation	1,719	(14,234)	(800)	(11,084)
Comprehensive income (loss)	3,884,734	(4,623,702)	388,688	(9,626,712)
Comprehensive income (loss) attributable to the Company	3,884,734	(4,617,070)	388,688	(9,608,208)
Comprehensive income/(loss) attributable to the non-controlling interest	0	(6,632)	0	(18,504)
Comprehensive (loss)	$ 3,884,734	$ (4,623,702)	$ 388,688	$ (9,626,712)
Basic income (loss) per share (in dollars per share)	$ 0.18	$ (0.31)	$ 0.02	$ (0.66)
Diluted income (loss) per share (in dollars per share)	$ 0.16	$ (0.31)	$ 0.02	$ (0.66)
Basic weighted average number of common shares outstanding (in shares)	21,657,181	14,715,947	19,683,610	14,472,322
Diluted weighted average number of common shares outstanding (in shares)	24,184,264	14,715,947	20,630,142	14,472,322