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v3.19.2

CONSOLIDATED BALANCE SHEETS - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 4,781,520 | $ 2,386,314
Short-term investment securities | 32,104,149 | 38,816,441
Interest receivable | 399,242 | 294,240
Accounts receivable | 504,510 | 318,744
Income tax receivable | 0 | 506,866
Prepaid research and development | 98,924 | 253,446
Prepaid expenses and other current assets | 112,136 | 172,001
Total current assets | 38,000,481 | 42,748,052
Non-current assets: |  |
Long-term investment securities | 1,516,670 | 0
Long-term income tax receivable | 500,616 | 500,616
Other assets | 51,575 | 52,139
Total assets | 40,069,342 | 43,300,807
Current liabilities: |  |
Accounts payable | 963,264 | 309,060
Accrued expenses | 396,041 | 399,576
Deferred research and development obligations | 90,572 | 141,002
Total current liabilities | 1,449,877 | 849,638
Commitments and contingencies (See Note 4) |  |
Stockholders' equity: |  |
Preferred stock | 0 | 0
Common stock | 39,365 | 38,967
Additional paid-in capital | 95,424,178 | 94,385,230
Treasury stock, shares held at cost | (18,929,915) | (18,929,915)
Accumulated deficit | (37,914,163) | (33,043,113)
Total stockholders’ equity | 38,619,465 | 42,451,169
Total liabilities and stockholders’ equity | $ 40,069,342 | $ 43,300,807

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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 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 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant