Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Balance Sheets
Accounts receivable, allowances (in dollars)	$ 4,329	$ 1,116
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	18,671,409	18,066,143
Common stock, shares outstanding	18,598,682	17,993,416
Treasury stock, shares	72,727	72,727