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CONDENSED BALANCE SHEETS - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 32,421,994 $ 28,027,688
Accounts receivable, net of allowance for doubtful accounts of $57,567 as of June 30, 2019 and $42,443 as of December 31, 2018 5,877,393 4,209,992
Investments 5,382,861 6,349,915
Inventory, net 4,368,651 4,059,443
Prepaid expenses and other current assets 637,106 526,787
Prepaid income taxes 1,289,526 1,367,892
Total current assets 49,977,531 44,541,717
Property and equipment, net 1,830,194 1,869,561
Intangible assets, net 821,937 832,519
Operating lease right-of-use asset 3,070,996  
Deferred income taxes, net 1,031,863 1,088,702
Other assets 112,455 109,759
Total assets 56,844,976 48,442,258
Current liabilities:    
Accounts payable 974,747 772,470
Accrued payroll and benefits 1,559,277 1,802,321
Other accrued taxes 52,549 133,000
Warranty reserve 75,057 74,524
Deferred revenue 1,853,403 1,798,784
Current portion of operating lease liability 233,743  
Other current liability 108,421 108,421
Total current liabilities 4,857,197 4,689,520
Deferred revenue 2,002,104 1,807,005
Operating lease liability, less current portion 2,837,253  
Total liabilities 9,696,554 6,496,525
Stockholders' equity:    
Common stock; $0.0001 par value; 31,500,000 shares authorized; 11,196,402 shares issued and outstanding as of June 30, 2019 and 10,989,111 shares issued and outstanding as of December 31, 2018 1,120 1,099
Additional paid-in capital 16,520,138 15,317,335
Retained earnings 30,603,897 26,669,491
Accumulated other comprehensive income (loss) 23,267 (42,192)
Total stockholders' equity 47,148,422 41,945,733
Total liabilities and stockholders' equity $ 56,844,976 $ 48,442,258