Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 1,052,401	$ (10,998,794)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	1,029,481	1,325,706
Share-based payment compensation	281,794	751,336
Non-cash professional services expenses	141,159	1,576,882
Loss on disposal of fixed assets	64,307	0
Provision for returns and doubtful accounts	93,816	69,391
Deferred income tax provision	(147,791)	(120,555)
Changes in operating assets and liabilities:
Accounts receivable	1,014,594	1,381,566
Prepaid expenses and other current assets	44,488	416,372
Inventory	6,181	64,353
Other assets	(787,527)	761,053
Accounts payable	728,260	(597,173)
Accrued expenses and other long-term liabilities	(694,418)	(1,993,076)
Deferred revenue	(5,401,165)	(2,060,557)
Net cash used in operating activities	(2,574,420)	(9,423,496)
Cash flows from investing activities:
Sales of marketable securities	0	7,566,000
Purchases of marketable securities	0	(150,000)
Purchases of property and equipment	(94,805)	(294,061)
Security deposits	2,052	127,100
Purchase of intangible assets	(90,965)	(115,913)
Net cash provided by (used in) investing activities	(183,718)	7,133,126
Cash flows from financing activities:
Payments for tax withholding for share-based compensation	(25,711)	0
Proceeds from issuance of short-term debt, net of issuance costs	351,656	0
Net cash provided by financing activities	325,945	0
Effect of exchange rate changes on cash and cash equivalents	52,137	(331,484)
Net decrease in cash and cash equivalents	(2,380,056)	(2,621,854)
Cash and cash equivalents, beginning of period	3,391,528	6,013,382
Cash and cash equivalents, end of period	1,011,472	3,391,528
Supplemental Disclosures:
Cash paid for income taxes, net	209,267	518,955
Non-cash financing activities:
Undistributed Series A redeemable convertible preferred stock dividends	873,043	195,904
Shares issued for Series A redeemable convertible preferred stock dividend payment	0	770,790
Detachable stock warrants issued with short-term debt	$ (22,310)	$ 0