CONSOLIDATED STATEMENTS OF OPERATIONS - (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 40,711	$ 45,137	$ 78,684	$ 86,520
Cost of sales	8,115	8,141	15,542	16,390
Gross profit	32,596	36,996	63,142	70,130
Operating expenses:
Commissions and incentives	16,295	19,322	31,494	36,307
Selling and administrative expenses	8,381	9,615	15,957	17,595
Depreciation and amortization expense	517	535	1,045	1,046
Other operating costs	5,384	7,873	11,507	16,419
Total operating expenses	30,577	37,345	60,003	71,367
Income (loss) from operations	2,019	(349)	3,139	(1,237)
Interest income (expense), net	25	133	(70)	162
Other income, net	980	476	984	764
Income (loss) before income taxes	3,024	260	4,053	(311)
Income tax provision	(1,037)	(644)	(1,378)	(337)
Net income (loss)	$ 1,987	$ (384)	$ 2,675	$ (648)
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0.83	$ (0.14)	$ 1.12	$ (0.24)
Diluted (in dollars per share)	$ 0.81	$ (0.14)	$ 1.09	$ (0.24)
Weighted-average common shares outstanding:
Basic (in shares)	2,394	2,674	2,395	2,696
Diluted (in shares)	2,452	2,674	2,457	2,696