CONDENSED BALANCE SHEETS - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 47,549,619	$ 43,481,781
Accounts receivable, net of allowance for doubtful accounts of $43,286 as of September 30, 2020 and $69,093 as of December 31, 2019	4,252,329	7,293,303
Investments	2,320,407	2,768,287
Inventory, net	4,589,741	3,641,561
Prepaid expenses and other current assets	475,039	407,802
Prepaid income taxes	3,716,442	1,370,947
Total current assets	62,903,577	58,963,681
Property and equipment, net	2,164,391	2,053,806
Intangible assets, net	975,879	860,087
Operating lease right-of-use asset	2,776,599	2,955,873
Deferred income taxes, net	1,346,214	1,663,415
Other assets	258,457	232,002
Total assets	70,425,117	66,728,864
Current liabilities:
Accounts payable	580,309	993,742
Accrued payroll and benefits	1,642,772	2,166,209
Other accrued taxes	123,196	596,576
Warranty reserve	87,059	81,761
Deferred revenue	1,956,180	1,671,420
Current portion of operating lease liability	251,901	240,843
Other current liability	108,421	108,421
Accrued income taxes	10,390
Total current liabilities	4,760,228	5,858,972
Deferred revenue	2,423,733	2,630,467
Operating lease liability, less current portion	2,524,698	2,715,030
Total liabilities	9,708,659	11,204,469
Stockholders' equity:
Common stock; $0.0001 par value; 31,500,000 shares authorized; 12,269,123 shares issued and outstanding as of September 30, 2020 and 11,765,875 shares issued and outstanding as of December 31, 2019	1,227	1,177
Additional paid-in capital	23,636,433	19,192,394
Retained earnings	37,032,037	36,300,450
Accumulated other comprehensive income	46,761	30,374
Total stockholders' equity	60,716,458	55,524,395
Total liabilities and stockholders' equity	$ 70,425,117	$ 66,728,864