BALANCE SHEETS - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 43,481,781	$ 28,027,688
Accounts receivable, net	7,293,303	4,209,992
Investments	2,768,287	6,349,915
Inventory, net	3,641,561	4,059,443
Prepaid expenses and other current assets	407,802	526,787
Prepaid income taxes	1,370,947	1,367,892
Total current assets	58,963,681	44,541,717
Property and equipment, net	2,053,806	1,869,561
Intangible assets, net	860,087	832,519
Operating lease right-of-use asset, net	2,955,873
Deferred income taxes, net	1,663,415	1,088,702
Other assets	232,002	109,759
Total assets	66,728,864	48,442,258
Current liabilities:
Accounts payable	993,742	772,470
Accrued payroll and benefits	2,166,209	1,802,321
Other accrued taxes	596,576	133,000
Warranty reserve	81,761	74,524
Deferred revenue	1,671,420	1,798,784
Current portion of operating lease liability	240,843
Other current liability	108,421	108,421
Total current liabilities	5,858,972	4,689,520
Deferred revenue	2,630,467	1,807,005
Operating lease liability, less current portion	2,715,030
Total liabilities	11,204,469	6,496,525
Stockholders' equity:
Common stock; $0.0001 par value; 31,500,000 shares authorized; 11,765,875 shares issued and outstanding as of December 31, 2019 and 10,989,111 shares issued and outstanding as of December 31, 2018	1,177	1,099
Additional paid-in capital	19,192,394	15,317,335
Retained earnings	36,300,450	26,669,491
Accumulated other comprehensive income (loss)	30,374	(42,192)
Total stockholders' equity	55,524,395	41,945,733
Total liabilities and stockholders' equity	$ 66,728,864	$ 48,442,258

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682