CONDENSED BALANCE SHEETS - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 23,699,164	$ 18,205,976
Accounts receivable, net of allowance for doubtful accounts of $52,756 as of September 30, 2018 and $37,225 as of December 31, 2017	5,219,259	3,778,929
Investments	7,487,283	8,135,123
Inventory, net	4,275,409	4,210,846
Prepaid expenses and other current assets	578,178	648,881
Prepaid income taxes	1,409,113	127,855
Total current assets	42,668,406	35,107,610
Property and equipment, net	1,879,619	1,868,851
Intangible assets, net	832,144	885,502
Deferred income taxes, net	1,227,043	950,375
Other assets	204,305	200,196
Total assets	46,811,517	39,012,534
Current liabilities:
Accounts payable	970,972	656,723
Accrued payroll and benefits	1,810,982	1,512,336
Other accrued taxes	86,281	109,502
Warranty reserve	39,951	60,538
Deferred revenue	1,776,953	1,617,571
Other current liability	108,421	108,571
Accrued income taxes		12,731
Total current liabilities	4,793,560	4,077,972
Deferred revenue	1,925,782	2,003,685
Total liabilities	6,719,342	6,081,657
Stockholders' equity:
Common stock; $0.0001 par value; 31,500,000 shares authorized; 10,933,989 shares issued and outstanding as of September 30, 2018 and 10,596,566 shares issued and outstanding as of December 31, 2017	1,093	1,060
Additional paid-in capital	15,203,263	12,623,181
Retained earnings	24,962,478	20,355,545
Accumulated other comprehensive loss	(74,659)	(48,909)
Total stockholders' equity	40,092,175	32,930,877
Total liabilities and stockholders' equity	$ 46,811,517	$ 39,012,534