Condensed Consolidated Balance Sheets [Parenthetical] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Adjustments for chargebacks and other allowances	$ 48,849	$ 47,705
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	1,666,667	1,666,667
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Treasury Stock, Common, Shares	2,000	11,179
Common Stock [Member]
Common Stock, Par Value (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, Authorized Shares	33,333,334	33,333,334
Common Stock, Issued Shares	12,024,282	11,862,508
Common Stock, Outstanding Shares	12,022,282	11,851,329
Class C Special Stock [Member]
Common Stock, Par Value (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, Authorized Shares	781,281	781,281
Common Stock, Issued Shares	10,864	10,864
Common Stock, Outstanding Shares	10,864	10,864