Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	22,000,000
Treasury stock, shares	9,500	0
Mezzanine B Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares designated	0	5,000,000
Convertible preferred stock, shares issued	0	1,242,069
Convertible preferred stock, shares outstanding	0	1,242,069
Convertible preferred stock value for liquidation preference		$ 32,840
Mezzanine A Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares designated	0	3,677,622
Convertible preferred stock, shares issued	0	3,677,622
Convertible preferred stock, shares outstanding	0	3,677,622
Convertible preferred stock value for liquidation preference		$ 50,420
Series 4 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares designated	0	1,833,333
Convertible preferred stock, shares issued	0	1,833,333
Convertible preferred stock, shares outstanding	0	1,833,333
Convertible preferred stock value for liquidation preference		$ 11,000
Series 3 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares designated	0	1,349,382
Convertible preferred stock, shares issued	0	1,322,570
Convertible preferred stock, shares outstanding	0	1,322,570
Convertible preferred stock value for liquidation preference		$ 7,538
Series 2 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares designated	0	1,226,242
Convertible preferred stock, shares issued	0	1,226,242
Convertible preferred stock, shares outstanding	0	1,226,242
Convertible preferred stock value for liquidation preference		$ 2,000
Series 1 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares designated	0	1,229,862
Convertible preferred stock, shares issued	0	1,229,862
Convertible preferred stock, shares outstanding	0	1,229,862
Convertible preferred stock value for liquidation preference		$ 1,000
Voting Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	22,000,000
Common stock, shares issued	15,949,492	2,235,838
Common stock, shares outstanding	15,939,992	2,235,838
Non-voting Common Stock
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	0	229,263
Common stock, shares issued	0	191,052
Common stock, shares outstanding	0	191,052