Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Allowance for accounts receivable	$ 546	$ 200
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series A
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	13,593,736	13,536,502
Common stock, shares outstanding (in shares)	13,593,736	13,536,502
Series B
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,500,000	1,500,000
Common stock, shares issued (in shares)	711,992	711,992
Common stock, shares outstanding (in shares)	711,992	711,992
Series C
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	83,000,000	83,000,000
Common stock, shares issued (in shares)	28,841,465	28,672,805
Common stock, shares outstanding (in shares)	28,841,465	28,672,805