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CONSOLIDATED BALANCE SHEETS (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 2,222,491us-gaap_CashEquivalentsAtCarryingValue $ 8,148,599us-gaap_CashEquivalentsAtCarryingValue
Accounts receivable, net of allowance for doubtful accounts of $2,404,659 and $2,071,706 at December 31, 2013 and 2014, respectively 7,810,417us-gaap_AccountsReceivableNetCurrent 6,225,923us-gaap_AccountsReceivableNetCurrent
Prepaid expenses and other current assets 1,182,748us-gaap_PrepaidExpenseAndOtherAssetsCurrent 981,908us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 11,215,656us-gaap_AssetsCurrent 15,356,430us-gaap_AssetsCurrent
Property and equipment, net 1,406,405us-gaap_PropertyPlantAndEquipmentNet 1,934,582us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 631,149us-gaap_IntangibleAssetsNetExcludingGoodwill 767,223us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 191,874us-gaap_OtherAssetsNoncurrent 0us-gaap_OtherAssetsNoncurrent
Total assets 13,445,084us-gaap_Assets 18,058,235us-gaap_Assets
Current liabilities:    
Accounts payable 1,609,741us-gaap_AccountsPayableCurrent 1,694,312us-gaap_AccountsPayableCurrent
Accrued expenses 671,906us-gaap_AccruedLiabilitiesCurrent 666,675us-gaap_AccruedLiabilitiesCurrent
Accrued interest 149,813us-gaap_InterestPayableCurrent 0us-gaap_InterestPayableCurrent
Accrued royalties 967,785us-gaap_AccruedRoyaltiesCurrent 1,293,717us-gaap_AccruedRoyaltiesCurrent
Accrued payroll and related liabilities 1,547,673us-gaap_EmployeeRelatedLiabilitiesCurrent 1,850,923us-gaap_EmployeeRelatedLiabilitiesCurrent
Capital lease obligation, current portion 100,951us-gaap_CapitalLeaseObligationsCurrent 157,238us-gaap_CapitalLeaseObligationsCurrent
Total current liabilities 5,047,869us-gaap_LiabilitiesCurrent 5,662,865us-gaap_LiabilitiesCurrent
Capital lease obligation, net of current portion 103,472us-gaap_CapitalLeaseObligationsNoncurrent 136,419us-gaap_CapitalLeaseObligationsNoncurrent
Line of credit 1,500,000us-gaap_LongTermLineOfCredit 1,000,000us-gaap_LongTermLineOfCredit
Term loan, net of debt discount of $536,150 7,963,850us-gaap_LongTermLoansPayable 0us-gaap_LongTermLoansPayable
Total liabilities 14,615,191us-gaap_Liabilities 6,799,284us-gaap_Liabilities
Commitments, contingencies and subsequent events (Notes 5 and 12)      
Common stock classified outside of stockholders’ equity (deficit) (Note 10) 0us-gaap_TemporaryEquityCarryingAmountAttributableToParent 5,500,000us-gaap_TemporaryEquityCarryingAmountAttributableToParent
Stockholders’ equity (deficit):    
Common stock, $0.01 par value; 70,000,000 shares authorized; 38,712,896 and 38,795,396 shares issued and outstanding at December 31, 2013 and 2014, respectively 388,010us-gaap_CommonStockValue 337,185us-gaap_CommonStockValue
Additional paid-in capital 77,698,416us-gaap_AdditionalPaidInCapitalCommonStock 70,986,406us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (78,996,541)us-gaap_RetainedEarningsAccumulatedDeficit (65,297,179)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (259,992)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (267,461)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders’ equity (deficit) (1,170,107)us-gaap_StockholdersEquity 5,758,951us-gaap_StockholdersEquity
Total liabilities, common stock classified outside of stockholders’ equity (deficit) and stockholders’ equity (deficit) $ 13,445,084us-gaap_LiabilitiesAndStockholdersEquity $ 18,058,235us-gaap_LiabilitiesAndStockholdersEquity