Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts receivables- current	$ 4,781	$ 3,382
Related party accounts receivable- current	184	349
Related party accounts payable- current	4,225	5,039
Related party accrued expenses and other current liabilities	$ 2,151	$ 218
Preferred stock, par value ( in dollar per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, share issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per shares)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	105,895,609	104,337,508
Common stock, shares outstanding (in shares)	105,895,609	104,337,508